From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The performance and inspection of various engine components, including the throttle, carburetter, pistons, and bearings.
| Identifier | ExFiles\Box 91\1\ scan0389 | |
| Date | 14th August 1936 guessed | |
| -4- we considered that the throttle spring was too stiff and made the pedal tiring to operate. We later replaced this spring by a much lighter one purchased locally and found this to be entirely satisfactory. We found that a fine spray of petrol would come from the float chamber Vent pipe when the car was being severely braked. This was cured by moving the vent pipe to the centre of the chamber lid.{A. J. Lidsey} Carburetter Air Silencer LOP.E. 88088. Lec. 5000. This silencer has given us no trouble, and we find that it is easy and simple to dismantle when required. It effectively silences the intake roar, on part throttle, but if the throttle pedal is depressed to the full extent, the roar becomes quite audible but dies away as soon as the car has reached a constant speed. It is possible, however, to eliminate all noise if the throttle is gradually opened until the required speed is obtained. Pistons. LOP.E. 86705. Although we were unable to examine these, we detected piston knocks on starting up from cold after a mileage of 6,000. Compressions were well maintained and the pistons gave no cause for complaint. Connecting Rods. LOP.E. 84691. It was decided that we should not examine the bearings unless a definite drop in oil pressure was noticed, or until any other trouble arose. The oil pressures remained constant, both at 70 M.P.H. and at 10 M.P.H. This was taken four times a day at an oil temperature of 100°C. the pressure at 70 M.P.H. being 30 lbs/sq.in., while 2-3 lbs/sq. in was recorded at the lower speed. Crankcase & Bearings - LOP.E. 87328. The main bearings were not dismantled, and gave no trouble throughout. | ||